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Title:
CIRCUIT BREAKER AND OPERATION CONTROL METHOD THEREOF
Document Type and Number:
Japanese Patent JP2010272297
Kind Code:
A
Abstract:

To provide a circuit breaker capable of reducing a cut-off current at cut-off and a passage energy caused by the cut-off current by processing an operation of overcurrent detecting function at high speed after starting a power supply without depending on the precision of an oscillation frequency of an internal oscillation circuit.

The circuit breaker includes: an external oscillation circuit 14 for generating a high-speed external clock for operating a microcomputer 8 at high speed; a time circuit 15 for setting a time period corresponding to an oscillation stable period from start of the external oscillation circuit to oscillation stabilization; and an operation clock selection circuit 13 which supplies a low-speed internal clock from an internal oscillation circuit 12 as the operation clock of the microcomputer at the start of the microcomputer, and selectively supplies a high-speed external clock from the external oscillation circuit as the operation clock of the microcomputer after the time set by the time circuit passes.


Inventors:
NOMURA TOSHIMITSU
TSUKAMOTO TATSUYUKI
Application Number:
JP2009122070A
Publication Date:
December 02, 2010
Filing Date:
May 20, 2009
Export Citation:
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Assignee:
MITSUBISHI ELECTRIC CORP
International Classes:
H01H83/02
Domestic Patent References:
JPS61123916A1986-06-11
JPH04251312A1992-09-07
JP2002524012A2002-07-30
JP2000113796A2000-04-21
JPH10126952A1998-05-15
JPH03223913A1991-10-02
JPS61123916A1986-06-11
JPH04251312A1992-09-07
JP2002524012A2002-07-30
JP2000113796A2000-04-21
Attorney, Agent or Firm:
Masuo Oiwa
Toshihide Kodama
Takenaka Ikuo
Keigo Murakami



 
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